Note 9 - Commitments and Contingencies (Detail) (USD $)	Mar. 31, 2013
Operating Leases, Future Minimum Payments Due	$ 786,000
Building Construction And Acquisition [Member]
Purchase Commitment, Remaining Minimum Amount Committed	8,700,000
Revenue Equipment [Member]
Purchase Commitment, Remaining Minimum Amount Committed	$ 3,200,000